37 Predictors of outcome for cognitive behaviour therapy in binge eating disorder 2 Table 3. Final model (and test statistics) for the prediction of post-treatment EDI bulimia scale scores as predicted from pretreatment measures. Model summary (n = 245) F (8,237) = 11.693 p < .01 R2 adj = .259 β t p EDI bulimia scale scores 0.366 5.517 < .01 EDI drive for thinness -0.119 -1.882 .06 EDI interoceptive awareness 0.126 1.763 .08 EDI ineffectiveness 0.227 2.511 .01 EDI perfectionism -0.106 -1.807 .07 SCL-90 depression -0.440 -3.040 < .01 SCL-90 total score 0.505 3.719 < .01 NEO-PI-R extraversion 0.173 2.602 .01 Note: EDI, Eating Disorder Inventory; SCL-90, Symptom Checklist-90; NEO-PI-R, Revised NeuroticismExtraversion-Openness Personality Inventory Means, standard deviations and correlations between pretreatment predictors and post-treatment outcome are presented in supplementary tables (Tables S1-S3). Prediction of follow-up bulimia scale scores Improvement after treatment A repeated-measures ANOVA with time (post-treatment/follow-up) as the within subject factor and bulimia scale scores as the dependent variable showed that patients’ bulimia scale scores did not change between post-treatment and follow-up: F (1, 179) = 0.322, p = .571. A similar repeated-measures ANOVA with BMI as the dependent variable showed that patients’ BMI scores significantly decreased between post-treatment and follow-up: F (1,187) = 11.754, p < .01, η2 = .059. The effect size of this decrease was weak. See Table 4 for the means and standard deviations. Table 4. Post-treatment and follow-up means (SD) of EDI bulimia scale scores and BMI for treatment completers who completed the follow-up measure. Post-treatment Follow-up EDI bulimia scale scores 2.25 (2.918) 2.12 (3.133) BMI * 41.01 (7.36) 39.90 (8.14) * p < .01 Note. BMI, body mass index; EDI, Eating Disorder Inventory
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